Can anyone explain how to do a local backup of contacts, calendar etc on nexus 5?

I am perfectly fine with using ssh/rsync for backing up .vault to pc, but if I understand correctly you need to create a backup from settings->backup->create before the backup is stored in .vault. Correct?

The problem is that the backup menu requires either a SD card or a cloud storage provider to be able to create a backup. I am not a big fan of cloud storage so using dropbox or onedrive is not an option and since the nexus 5 doesn't have a SD card slot I am out of options for creating the backup.

I guess it would be possible to backup $HOME, but I would prefer a specific backup file which can be used to restore from the menu.

Edit: Using SFOS 2.0.4.13